CHAPTER 1: INTRODUCTION SPECIFICATIONS
869 MOTOR PROTECTION SYSTEM – INSTRUCTION MANUAL 1–23
PHASORS
Current
Parameters:...........................................................Phase A, B, C, Neutral and Ground
Magnitude Accuracy: ........................................± 0.5% of reading or ± 0.2% of rated (whichever is greater)
from 0.1 to 2.0 x CT
± 1.0% of reading > 2.0 x CT
Angle Accuracy:...................................................2° (3° for 25 Hz)
For 50:0.025 CT between 0.5A to 15A:
CBCT Angle Accuracy:.......................................± 25°
Voltages
Parameters:...........................................................Wye VTs: A-n, B-n, C-n, A-B, B-C, C-A, Average Phase, Neutral
and Residual;
Delta VTs: A-B, B-C, C-A, Neutral and Residual
Magnitude Accuracy: ........................................± 0.5% of reading from 15 to 208 V;
± 1% for open Delta connections;
± 10% for 25 Hz with 150 V <V < 208V
Angle Accuracy:...................................................0.5° (15 V <V < 208 V)
FREQUENCY
Range: ......................................................................2.000 to 90.000 Hz
Accuracy at:...........................................................V = 15 to 208 V: ± 0.01 Hz (input frequency 15 to 70 Hz);
I = 0.1 to 0.4 x CT: ± 0.020 Hz (input frequency 15 to 70 Hz);
I > 0.4 x CT: ± 0.01 Hz (input frequency 15 to 70 Hz)
CURRENT AND VOLTAGE HARMONICS
Parameters:...........................................................Magnitude of each harmonic and THD
Range: ......................................................................2
nd
to 25
th
harmonic: per-phase displayed as % of f
1
fundamental frequency
THD: per-phase displayed as % of f
1
DEMAND
Measured Values: ...............................................Phase A/B/C present and maximum current
Measurement Type:...........................................Thermal Exponential, 90% response time (programmed): 5,
10, 15, 20, 30 minutes
Block Interval / Rolling Demand, time interval (programmed):
5, 10, 15, 20, 30 minutes
Current Pickup Level:.........................................10 to 10000 in steps of 1 A
Dropout Level: ......................................................96-98% of Pickup level
Level Accuracy:....................................................± 2%
FAST PATH:
Factory tested at 25°C
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